the popular celebration, families paint each other and toss colored water and powders that represent energy, life, and joy. on sunday, western christians observe palm sunday. it marks the beginning of holy week -- days of prayers and services, among them holy thursday and good friday, all leading up to the celebration of easter, next sunday. >>> this coming monday night, passover begins. jews remember their ancestors' deliverance from slavery in egypt, and their wandering for 40 years in the desert until, finally, they reached the promised land. we have a story today about jews going to arches national park in utah to commemorate passover and the exodus by walking in the desert, just as jews did in biblical times. our guide was rabbi jamie korngold, also known as "the adventure rabbi." >> the desert is absolutely the right place to be telling this story. the core of this story is that the israelites went down to egypt as a family. they come out, 600,000 people, and then they wander in the wilderness and become a nation. it's in the wilderness where they meet god. it's in the wilderness wher